中文摘要：

在考虑了支洞和主变洞影响的情况下,以某水电站地下主厂房四层施工通风为例,对主厂房施工通风的风流组织和污染物扩散过程进行了模拟研究。结果表明：由工作面至出口,速度逐渐减小,主厂房内大部分区域速度小于0.15m/s,X-Y剖面处存在涡流区;在主厂房内出口处存在一个高浓度区,且主厂房内的CO和粉尘分布趋势相似,并以Nakayama等的矿井通风甲烷浓度分布实验结果进行了验证,模拟结果与实验基本吻合。

英文摘要：

The airflow field and contamination migration during the construction ventilation of the fourth layer of underground powerhouse is simulated taking into account influences of the branch tunnel and the main transformer chamber on the ventilation of the underground powerhouse. The velocity decreases along with increasing distance from the heading face. And the velocity at a majority of underground powerhouse is less than 0.15m/s. There is an eddy zone at the X-Y section and a high concentration range of the contaminant around the outlet. The migration rule of CO is similar to the migration tendency of the dust. A comparison between the concentration field predicted by the model and the experimental data of Nakayama et al. indicates a good agreement.